EP4204159A1 - Schwingungsmessanordnung - Google Patents
SchwingungsmessanordnungInfo
- Publication number
- EP4204159A1 EP4204159A1 EP21769688.9A EP21769688A EP4204159A1 EP 4204159 A1 EP4204159 A1 EP 4204159A1 EP 21769688 A EP21769688 A EP 21769688A EP 4204159 A1 EP4204159 A1 EP 4204159A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- treatment
- sensor
- housing
- vibrations
- time intervals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/11—Details
- B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
- G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
- G01M1/22—Determining imbalance by oscillating or rotating the body to be tested and converting vibrations due to imbalance into electric variables
Definitions
- the invention relates to a device for treating fibrous material with a sensor for detecting vibrations.
- the device has a multi-part housing.
- the housing includes a lid.
- the device also has fiber treatment tools, wherein the fiber treatment tools are arranged at a distance from one another to form at least one treatment gap with treatment profiles pointing towards one another and are mounted such that they can rotate relative to one another.
- At least one treatment tool is mounted so that it can be displaced axially in order to set a width of the at least one treatment gap between the treatment profiles that face one another.
- At least one of the treatment tools is carried by a housing part.
- the treatment tools have a rotationally symmetrical shape and are arranged coaxially with one another.
- Two treatment tools delimit a treatment gap through which the fibrous material flows radially and the treatment tools each have a treatment profile pointing towards the treatment gap. If several treatment gaps are provided, provision can be made for at least one treatment tool to be axially floating.
- the invention also relates to a method for minimizing wear in a device for treating fibrous material, the device having a multi-part housing in which at least a first treatment tool and a second treatment tool are arranged, the treatment tools have a rotationally symmetrical shape and are arranged coaxially to one another , rotate relative to one another about a common axis, two treatment tools in each case delimit a treatment gap through which the fibrous material flows radially and the treatment tools each have a treatment profile pointing towards the treatment gap, with at least one treatment tool being mounted in an axially floating manner, two housing parts each carrying at least one treatment tool via a a joint rotatable about a joint axis are coupled to each other and the device is equipped with at least one sensor.
- a refiner for treating a fiber suspension used for papermaking is known from US 2007/0125891 A1.
- a vibration sensor is provided in this refiner, which detects when the treatment tools are touched.
- the sensor is arranged inside the refiner on a carrier of a stationary treatment tool.
- the sensor detects axial vibration movements. Due to the axial vibration movements, it can be concluded that the treatment tools are touching.
- Two vibration sensors can also be provided, each of which is provided on a stationarily arranged carrier of a treatment tool.
- a refiner and a method for attaching or detaching refiner discs are known from EP 792 689 B1.
- the refiner has a grinding chamber.
- the reduction chamber includes a main portion.
- the main section is closed by a lid.
- the lid is hinged to the main portion and can be opened, and in the open position the lid is supported by the hinge.
- the treatment gap which is enlarged as a result, leads to a reduction in the no-load or pump output. With the overall performance remaining the same, this leads at the same time to an increase in the specific performance of the device, which is relevant for the desired treatment intensity, and thus to excessive treatment, in particular grinding of the fibers. If the gap is too small, there is a risk of excessive electrical current consumption and contact between the treatment tools.
- the grinding surfaces are formed by replaceable grinding sets screwed to the corresponding base plate.
- the refining clothing In order to achieve the desired fiber properties, in particular the SR value (Schopper-Riegler value), the refining clothing must be optimally adapted to the fibrous material to be treated, also to prevent excessive wear of the clothing in addition to ideal fiber treatment.
- Refiners can be designed as disc refiners or cone refiners.
- Double-slit arrangements are increasingly being used to increase throughput. Due to the axially floating rotor, no reliable statements can be made about the gap width and the state of wear. In theory, the same gap widths should result in hydraulic equilibrium, but practice has shown that gap widths of different widths can occur during operation.
- the invention is based on the object of providing a device and a method by means of which a high level of wear on grinding sets caused by contact with the treatment profiles during operation can be reduced.
- the object of the invention is therefore to minimize the wear on the treatment tools in these devices using the simplest possible means. Furthermore, it is the object of the invention to provide a method with which the wear of the treatment tools can be minimized.
- the object was achieved according to the invention in that the sensor for detecting vibrations of the device is arranged on the housing of the device.
- the sensor is preferably arranged on the outside of the housing. The sensor is easily accessible due to the arrangement on the housing. This arrangement of the sensor allows for easy maintenance and replacement, as well as easy retrofitting.
- the senor To detect vibrations that indicate contact between the treatment tools, it has proven to be advantageous to arrange the sensor on a housing part that carries a treatment tool.
- a housing part is stationary and at least the sensor is accommodated on or in the housing part, referred to as the cover, which can be pivoted away from this via the joint.
- the sensor should detect the vibration acceleration and/or vibrations in the range between 4 and 12 kHz.
- Sensors in the form of uniaxial acceleration pickups which are preferably aligned parallel to the axis of the device, are particularly suitable for this purpose.
- This axis is also parallel to the width of the treatment gap in the case of planar treatment profiles. If conical treatment profiles are intended, it has proven to be advantageous for the axis of the uniaxial accelerometer to be aligned parallel to the width of the treatment gap.
- the width of the treatment gap is formed perpendicularly to the treatment surfaces.
- Uniaxial accelerometers are mass-produced at low cost.
- the invention is preferably used in devices in which there are two treatment gaps in the housing and the two middle treatment tools are attached to a common, rotating base plate which is mounted in an axially floating manner.
- this is also possible during deflaking or dispersing. If a wear-critical condition (contact of the treatment tools or insufficient fibrous material suspension cushion of a treatment gap) is detected, this condition can be easily eliminated if the axial position of at least one treatment tool of a housing part can be adjusted. In this way, the increased wear can be counteracted simply by widening the treatment gap.
- the cover of the housing is rotatably mounted about a hinge axis.
- at least two hinges are provided. It has proven to be advantageous to arrange the sensor in an area between the hinges on the housing, preferably on the cover. The area between the hinges is delimited by planes running perpendicular to the axis of the joint. If the joint axis runs vertically, the sensor is arranged in a horizontal area between the hinges.
- a position between the hinges that runs parallel to the treatment gap has proven to be particularly suitable, with the sensor axis being aligned in the direction of the gap width. In this way, in particular, vibrations can be detected which are due to the treatment profiles of the treatment tools touching.
- the vibration intensity in particular the vibration acceleration or the standard deviation of the vibration acceleration
- the determined oscillation signals are filtered using a high-pass filter, in particular with a high-pass filter of at least 4000 Hz, preferably at least 5000 Hz.
- the vibration threshold value also referred to as the vibration peak
- the vibrations in particular the Vibration acceleration over a predetermined number of time intervals. If the oscillation threshold value is exceeded in at least half of the time intervals, malfunction is signaled.
- a preferred embodiment provides that a measurement lasts at least 2 seconds over a time interval. In one embodiment it is provided that the time intervals are of identical length.
- contact between two treatment tools should only be inferred if there is at least one vibration peak in at least two predetermined time periods, preferably in at least three of at least five consecutive predetermined time intervals.
- the reliability can be improved in that fundamental vibrations in the area surrounding the device are taken into account.
- a basic value of operational vibrations is learned each time the device is started up. As a result, fundamental vibrations caused by an environment can be eliminated.
- the standard deviation can have lower values compared to a determined vibration acceleration if the machine is operated quietly and under high load.
- FIG. 1 a double disc refiner in the open state
- FIG. 2 a side view of the closed refiner
- FIG. 4 a schematic cross section through the refiner.
- Fig. 5 Representation of the sensor data and the time interval method
- the annular treatment profile 10 of these treatment tools 1, 2, 3, 4, each pointing towards the treatment gap 11, 12, is formed by grinding sets which have a large number of essentially radially running grinding bars on the profile side, so that this profile is formed by these grinding bars and the ones in between grooves is formed.
- the fiber suspension to be ground arrives here via an inlet through the center of the device into one of the two treatment gaps 11, 12 between the grinding sets.
- the fiber suspension then passes through the interacting treatment tools 1, 2, 3, 4 radially outwards and collects in the adjoining annular space.
- the cross-section of the grinding bars also called knives, is generally rectangular, but other shapes also exist.
- the upper side of these grinding bars that is to say the surfaces bearing the grinding edges, which close off the respective grinding set in the direction of the counter-set, lie in the radial plane.
- the grooves running between the milling bars also have a rectangular cross-section and serve as flow channels for the fiber suspension.
- the groove depth is usually between 2 and 20 mm.
- the treatment tool 2, 3 adjacent to the other treatment gap 11, 12 of both treatment gaps 11, 12 rotates with an axis 5 passing through the center of the treatment profile 10.
- These rotating treatment tools 2, 3 are on a common, axially the rotating axis 5 displaceable and co-rotating base plate 14 releasably attached.
- This axis 5 is driven, as can be seen in Figure 2, by a drive 16 coupled via a gear 15.
- the housing of the device is formed, in particular according to FIGS. 1 and 3, by a large fixed housing part 7 mounted on a machine foundation 17 and a smaller housing part 8 in the form of a cover which can be pivoted away from this.
- These two housing parts 7, 8, each carrying a non-rotating treatment tool 1, 4, are coupled to one another via a joint 9, which can be rotated about a joint axis 13 and is designed in two parts, for example.
- the other non-rotating treatment tool 1 can be displaced axially along the axis of rotation 5 via an adjustment device 18 to adjust the overall width of both treatment gaps 11, 12.
- This sensor 6 is designed as a uniaxial acceleration sensor using the piezoelectric measuring principle and is aligned parallel to the axis 5 .
- the sensor 6 detects vibrations in the range between 5 and 12 kHz and, in the process, measures the vibration acceleration.
- At least one sensor 6 is arranged in the housing in the vicinity of the joint 9 in order to reliably measure vibrations in order to minimize wear in such devices for treating pulp. Due to the higher stress, this area also has a higher rigidity.
- this sensor 6 is located in housing part 8 that can be pivoted away via joint 9 and there approximately between the two door hinges of joint 9 , the straight line between sensor 6 and shaft 5 running approximately perpendicular to joint axis 13 .
- Oscillation signals are plotted in FIG.
- the device controller In order to rule out false signals, especially if the treatment tools 1, 2, 3, 4 come into contact for only a very short time, the device controller only concludes that there is contact between two treatment tools 1, 2, 3, 4 if at least three out of five in succession Lying, predetermined time intervals 25, the predetermined vibration threshold is exceeded at least once. Vibrating time intervals 28 and normal time intervals are shown. Measurement windows are shown, each with 5 time intervals, with incorrect operation with signaling only occurring in the middle measurement window, since a minimum number of time intervals subject to oscillations is only detected in this measurement window.
- FIG. 6 shows a graph in which the vibration acceleration and, in comparison thereto, the standard deviation of the vibration acceleration are plotted over time.
- the axial position of the non-rotating treatment tool 1 carried by the pivotable housing part 8 is adjusted by the adjustment device 18 to widen the treatment gap 11, 12 adjusted accordingly.
- the invention can also be used with conical grinding surfaces, the cone axis coinciding with the axis of rotation 5 and with devices with only one treatment gap.
- the invention relates to an apparatus and a method for fiber treatment.
- the device has a multi-part housing in which at least a first treatment tool (1, 3) and a second treatment tool (2, 4) are arranged.
- the treatment tools (1, 2, 3, 4) have a rotationally symmetrical shape and are arranged coaxially to one another and can be rotated relative to one another about a common axis (5).
- Two treatment tools (1, 2, 3, 4) in each case delimit a treatment gap (11, 12) through which the fibrous material flows radially.
- Two housing parts (7, 8), each carrying at least one treatment tool (1, 2, 3, 4), are connected via a joint that can rotate about a joint axis (13). (9) coupled together.
- Contact between two treatment tools (1, 2, 3, 4) is reliably detected by at least one sensor (6) arranged on the housing, preferably a sensor (6) arranged on the outside, for detecting vibrations.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Crushing And Grinding (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020122533.4A DE102020122533A1 (de) | 2020-08-28 | 2020-08-28 | Schwingungsmessanordnung |
| PCT/EP2021/073464 WO2022043363A1 (de) | 2020-08-28 | 2021-08-25 | Schwingungsmessanordnung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4204159A1 true EP4204159A1 (de) | 2023-07-05 |
Family
ID=77739057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21769688.9A Pending EP4204159A1 (de) | 2020-08-28 | 2021-08-25 | Schwingungsmessanordnung |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12440850B2 (de) |
| EP (1) | EP4204159A1 (de) |
| CN (1) | CN115989351B (de) |
| DE (1) | DE102020122533A1 (de) |
| WO (1) | WO2022043363A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE546721C2 (en) * | 2022-12-02 | 2025-02-11 | Cellwood Machinery Ab | Gap width monitoring |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4233600A (en) * | 1978-06-07 | 1980-11-11 | Pulp And Paper Research Institute Of Canada | Method and system for detecting plate clashing in disc refiners |
| SE454189B (sv) * | 1985-05-06 | 1988-04-11 | Sunds Defibrator | Sett att kontrollera den framstellda massans egenskaper i en raffinorprocess genom utnyttjande av uppmetta vibrationer i maldonen |
| WO1991010904A1 (en) * | 1990-01-11 | 1991-07-25 | Pulp And Paper Research Institute Of Canada | Acoustic emission monitoring of wood chip refiners |
| JP2758140B2 (ja) * | 1994-08-10 | 1998-05-28 | 相川鉄工株式会社 | リファイナのディスクの着脱方法 |
| DE69606621T2 (de) | 1996-03-01 | 2000-06-21 | Aikawa Iron Works Co., Ltd. | Refiner und Verfahren zum Befestigen oder Lösen von Refinerscheiben |
| JP2003112069A (ja) * | 2001-10-09 | 2003-04-15 | Mitsubishi Paper Mills Ltd | ダブルディスクリファイナーの制御方法 |
| US7309036B2 (en) | 2005-12-05 | 2007-12-18 | Gl&V Management Hungary Kft | Refining member clash control method |
| SE529525C2 (sv) * | 2006-01-16 | 2007-09-04 | Metso Paper Inc | Förfarande och anordning för kontroll av uppriktningen mellan malytor |
| EA021908B1 (ru) * | 2008-12-22 | 2015-09-30 | С.П.М. Инструмент Аб | Способ, устройство и машиночитаемый носитель для анализа состояния машины, имеющей вращающуюся часть |
| US7970556B2 (en) * | 2009-01-30 | 2011-06-28 | General Electric | System and method for monitoring the condition of a gear assembly |
| CN106102918B (zh) * | 2014-03-12 | 2020-05-19 | 株式会社成长技术 | 粉碎机的运转控制系统和诊断装置 |
| EP3500370B1 (de) * | 2016-08-22 | 2020-06-24 | Bühler AG | Überwachungs- und steuerungsvorrichtung zur automatisierten optimierung der vermahlungslinie eines walzensystems und entsprechendes verfahren |
| CN107866187A (zh) * | 2016-09-26 | 2018-04-03 | 新昌县东茗乡德创机械厂 | 一种分散机的自动感应调节装置 |
| CN109296506B (zh) * | 2018-10-26 | 2020-09-11 | 许昌许继风电科技有限公司 | 一种风电机组的振动检测方法、控制方法及装置 |
| WO2020163459A1 (en) * | 2019-02-06 | 2020-08-13 | Andritz Inc. | Refiner plate segments having feeding grooves |
-
2020
- 2020-08-28 DE DE102020122533.4A patent/DE102020122533A1/de active Pending
-
2021
- 2021-08-25 EP EP21769688.9A patent/EP4204159A1/de active Pending
- 2021-08-25 WO PCT/EP2021/073464 patent/WO2022043363A1/de not_active Ceased
- 2021-08-25 CN CN202180052102.6A patent/CN115989351B/zh active Active
-
2023
- 2023-02-28 US US18/115,403 patent/US12440850B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20230213405A1 (en) | 2023-07-06 |
| US12440850B2 (en) | 2025-10-14 |
| CN115989351B (zh) | 2026-01-23 |
| WO2022043363A1 (de) | 2022-03-03 |
| DE102020122533A1 (de) | 2022-03-03 |
| CN115989351A (zh) | 2023-04-18 |
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